Returns the two-tailed P-value of a z-test. The z-test generates a standard score for x with respect to the data set, array, and returns the two-tailed probability for the normal distribution. You can use this function to assess the likelihood that a particular observation is drawn from a particular population.
Syntax
ZTEST(array,x,sigma)
Array is the array or range of data against which to test x.
X is the value to test.
Sigma is the population (known) standard deviation. If omitted, the sample standard deviation is used.
Remarks
Example
The example may be easier to understand if you copy it to a blank spreadsheet.
Selecting an example from Help
Data | |
---|---|
3 | |
6 | |
7 | |
8 | |
6 | |
5 | |
4 | |
2 | |
1 | |
9 | |
Formula | Description (Result) |
=ZTEST(A2:A11,4) | Two-tailed P-value of a z-test for the data set above, at the value of 4 (0.090574) |